<!DOCTY PE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文件上传下载</title>
</head>
<body>
普通表单：<br>
<form action="http://127.0.0.1:8080/file/submit" method="post" enctype="application/x-www-form-urlencoded">
    username: <input type="text" name="username" value="username"><br>
    password: <input type="password" name="password" value="password"><br>
    submit: <input type="submit" value="提交"><br>
</form>
文件上传：<br>
<form action="http://127.0.0.1:8080/file/upload" method="post" enctype="multipart/form-data">
    username: <input type="text" name="username" value="username"><br>
    password: <input type="password" name="password" value="password"><br>
    images: <input type="file" name="images"><br>
    images: <input type="file" name="images"><br>
    desc: <input type="file" name="desc"><br>
    submit: <input type="submit" value="上传"><br>
</form>
<hr>
文件下载：<br>
http://localhost:8080/file/download/{filename}
</body>
</html>